Li Wenda, who used to be a top student in a prestigious school, fell to the bottom of his life due to a career disappointment and love affair. Stumbling around, he barely made a living on the edge of the city, wandering around the corners of the city with a group of people who were also 'upside down'. By chance, he met Yang Kexin, a white-collar worker in his current company (who he once had a crush on), and got involved in an entrepreneurial turmoil. He battled wits and courage with the sinister boss Chen Guoyuan, fighting for his career and growth. Under the triple attack of friendship, love and dreams, Wenda and his partners gradually rewrote their "upside-down life" with humor and enthusiasm. The four volumes of the book show the adversity struggles and relaxed and humorous life philosophy of urban little people.